Can't believe i spent this many years finding SPRING

I'm looking for a Spring game that complies completely with all of the OTA rules and constraints.
Eg:
-same units with original unit models from OTA (even if they look bad in Spring)
-same turn rates, firing ranges, and accuracy etc of units.
-same currency and time constraints etc.
SO far XTA looks the most like this?
BA also looks good but it looks like its gone down its own path in terms of currency and unit "performance".
Any help much appreciated, in the mean time ill be downloading XTA :)
Edit:
Oh and i didn't want to have to import all the original OTA units and "performance" data if i don't have to. (but i might, and then i might start remodelling/improving the OTA units that i like)